Backup Battery Flowing Current Verification; Dsc Self Check Test - Icom IC-M803 Service Manual

5-5 BACKUP BATTERY FLOWING CURRENT VERIFICATION

1. Turn OFF the transceiver's power.
2. Remove the top cover. (Refer to DISASSEMBLY INSTRUCTIONS in SECTION 3.)
3. Remove the backup battery (BT5081) from J5081 on the MAIN UNIT.
4. Apply 3.0 V DC to the point in the illustration shown below, through the digital multimeter.
5. Verify that the current value indicated on the digital multimeter is less than 0.8 μA.
6. Insert the backup battery into J5081 on the MAIN UNIT, and then attach the top cover.

5-6 DSC SELF CHECK TEST

The Self Check test sends DSC signals to the receiving AF circuit to compare the sending and receiving signals at the AF level.
1. Open "Self Check Test."
[ [MENU] > DSC Settings > Self Check Test ]
2. Push , or to start the Self Check Test.
3. When the sending and receiving DSC signals match, "OK" is displayed.
Backup battery
MAIN UNIT
J5081 J5081
DIGITAL MULTIMETER
(0.1 μA to 1 mA )
5-6
DC POWER SUPPLY #2
(3.0 V/1 mA or more)